"... contains a number of articles written by Niels Bohr during the last five years of his life"-- from preface.
Kim Sneppen Bücher
A new, popular edition with a clear introduction. Featuring two works of quantum theory from the early years of the 20th Century, representing breakthroughs in science that radically altered the landscape of modern knowledge: Quantum Theory of Line-Spectra by Niels Bohr and The Origin and Development of the Quantum Theory by Max Planck.